隧道环境下频率域声波全波形反演优化方法对比

Comparison of Optimization Methods for Frequency-domain Acoustic Full Waveform Inversion Based on Tunnel Space

隧道地震超前探测方法是获取隧道前方复杂地质体结构的重要手段,对隧道工程的安全建设和灾害防治极为重要。针对目前隧道地震超前探测方法获取掌子面前方地质体结构和物性精度不足的问题,本研究将高分辨率的频率域声波全波形反演方法应用于隧道超前探测,并讨论了最速下降法(STD)、截断牛顿法(TRN)以及l-BFGS三种主要反演优化方法在隧道全波形反演中的迭代收敛速度、反演精度和计算效率,以期获取综合效果较好的隧道空间掌子面前方高分辨率成像全波形反演优化方法。通过对比得出,l-BFGS优化方法在反演精度、反演速度中存在明显优势,更适合隧道环境下的频率域全波形反演成像,这一结果可为全波形反演方法在隧道超前探测研究提供借鉴。

Tunnel seismic advanced detection is an important means to obtain the complex geological structure in front of the tunnel,which is very important for the safety construction and disaster prevention of tunnel engineering.At present,aiming at the problem of insufficient accuracy of geological structure and physical properties in front of tunnel face obtained by advanced seismic detection method,this paper applies high-resolution frequency domain acoustic full waveform inversion method to the tunnel advanced exploration.The iterative convergence rate,inversion accuracy and computational efficiency of three main inversion optimization methods(STD,TRN and l-BFGS)in tunnel full waveform inversion are discussed in order to obtain full waveform inversion optimization method of high-resolution imaging in front of tunnel with better integrated effects.Through comparison,it is concluded that l-BFGS optimization method has obvious advantages in inversion accuracy and inversion speed,which is more suitable for full waveform inversion imaging in frequency domain under tunnel environment.This result can provide reference for the research of full waveform inversion method in tunnel advanced detection.